Einhorn was also a participant in the World Series of Poker. And, oh yeah, he came very close to buying a slice o the New York Mets last summer.

Most recently, Einhorn has been in the news for his clash with Green Mountain Coffee Roasters, a Waterbury, Vt.- based coffee company, which was one of the best performing stocks of the year until the Greenlight Capital boss took it to task during a 110-slide presentation at a prominent investor gathering in October.

First there was his protracted battle with Allied Capital, a leverarged buyout financier, which began in 2002 when Einhorn said the company was overvaluing its investments. Allied executives at the time called Einhorn’s claims unfounded, saying the company was committed to transparency.

Einhorn later wrote the book, “Fooling Some People All of the Time,” in which he zeroed in on his struggle with Allied. Mr. Einhorn bet against the company’s shares and eventually made millions on the investment. The company was eventually acquired.

Then, in 2008, Einhorn cemented himself as one of Wall Street’s toughest corporate critics as he publicly tangled with Lehman Brothers executives in the months before the firm collapsed in 2008. Things havenâ€™t always worked out so well for Einhorn.

Last May, Einhorn and the owners of the New York Mets baseball team made public that he planned to buy a slice of the team. But by the end of the summer, the deal fell apart. “We’re finished here,” Mr. Einhorn said at the time. “We’re done.”

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Deal Journal is an up-to-the-minute take on the deals and deal makers that shape the landscape of Wall Street, including mergers and acquisitions, capital-raising, private equity and bankruptcy. In short, wherever money changes hands. Deal Journal is updated throughout each trading day with exclusive commentary, analysis, data, news flashes and profiles. The Wall Street Journal’s David Benoit is the lead writer, with contributions from other Journal reporters and editors. Send news items, comments and questions to deals@wsj.com.